Asked whether he also stood by findings in the FWA report that Mr Thomson had provided false and misleading information to the FWA, he said "Yes."

While Mr Nassios missed a Senate estimates hearing he was called to due to being on long service leave, he attended the joint parliamentary committee via a phone hook-up.

Mr Thomson has maintained his innocence in the face of Mr Nassios's report, which detailed allegations Mr Thomson, as the then national secretary of the union, had used members' funds on prostitutes among other things.